Rotations of Bulk Ions and Impurities in Non-Axisymmetric Toroidal Systems

概要

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Neoclassical rotations are investigated theoretically for a plasma consisting of elecirons, bull< Tons, and impurities in non-axisymmetric toroidal systems. Impurity ionsare assumed to lie in the Pfirsch-Schltter collisionality regime. The results include thecase of tokamaks. It is found that the rotations of impurities are genarally differentfrom those of bulk tons. The difference comes from mainly the different diamagneticflows between bulk ions and impurities. In the 1 7 v regime or banana regime the gradient of bulk ion temperature may be another cause for the different rotations between the txvo species. However, in the region where the configuration is far from theaxisymmetry the cause of different rotations is just the different diamagnetic flows. Asthe poloidal rotations depend on the radial electric field contrary to the axisymmetricsystem, a relationship, which does not include the radial electric field, can be derivedbetween poloidal and toroidal rotations. By estimating this relationship based on themeasured rotations the present neoclassical theory can be validated withoutknowledge of radial electric field.[neoclassical theory, non-axisymmetric system, geometric factor, rotation, ll viscosity, impurity, 1 / v regime, plateau regime, Pfirsch-Schliiter regime l
社団法人日本物理学会の論文
1991-12-15